Tag: introduction to cell

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Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

What is an isotonic solution?

  1. A solution whose water concentration is lower than the internal concentration.

  2. A solution whose water concentration is same as compared to internal concentration.

  3. A solution whose water concentration is more than the internal concentration.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • If both the medium and cell has exactly the same water concentration and thus, there will be no net movement of water across the cell membrane is known as an isotonic solution. 
  • The cells remain of the same size.

    Hence, the correct option is B.
Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

In a hypotonic solution, the cell 

  1. Shrinks

  2. Remains of the same size

  3. Swells

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hypotonic solution is a type of solution in which water concentration in the medium is more than the cell. Water crosses the membrane in both directions, but more water will come into the cell than will leave. The net result is that the water enters the cell. The cells will swell up. 

Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

Solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell is a 

  1. Hypertonic solution

  2. Isotonic solution

  3. Hypotonic solution

  4. Both A and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell. Water crosses the cell membrane in both directions, but more water leaves the cell than enters it. Therefore, the cell will shrink due to exosmosis.

Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

If a cell is in a hypotonic environment, this means

  1. There are fewer solutes inside the cell than in the extra-cellular environment

  2. There is an equal amount of solutes inside as outside the cell

  3. There is more solute outside the cell than in the cell

  4. There is less solute outside the cell than inside of the cell
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A hypotonic environment is when the solute concentration outside the cell is less than inside the cell.

When both the regions have the same solute concentration it is an isotonic environment.
When the solute concentration outside the cell is higher than inside the cell then it is in a hypertonic environment.
So the correct answer is 'There is less solute outside the cell than inside the cell'.

Multiple choice biology the fundamental unit of life introduction to cell what are the living organisms made of organisation of the organism cell membrane and cell wall cell wall cell division in embryo development

Roots will absorb water when external medium will be

  1. Hypotonic

  2. Hypertonic

  3. Isotonic

  4. Concentrated
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Osmosis happens along a concentration gradient. If outside medium is hypotonic, it means that relatively more of water is present outside the cells in the surrounding medium and water will flow inside the root hair cells.

Multiple choice biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

The structure that are involved in the manufacture and supply of energy to the cell are:

  1. Centroies

  2. Nucleoius

  3. Pestide

  4. Mitochondria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mitochondria is responsible for manufacturing and supplying chemical energy by releasing energy stored in food molecules and synthesising ATP. It is called the power house of the cell. 

So, the correct option is 'Mitochondria'.

Multiple choice biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

The function of bulliform cells is to.

  1. These are present in some desertic grasses

  2. These are large and empty

  3. Reduce the rate of transpiration

  4. Perform nitrogen fixation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bulliform cells are specialized large, bubble-shaped epidermal motor cells found in the upper epidermis of many monocot leaves, such as grasses. When water is abundant, they are turgid and cause the leaf to expand, but under water stress, they lose turgor and cause the leaf to roll or fold, which helps reduce the rate of transpiration. The other options describe general characteristics or incorrect physiological roles.

Multiple choice biology organisation of the organism introduction to cell what are the living organisms made of component of the cell

Assume a spherical mammalian cell has diameter of 27 $\mu m$, If a polypeptide chain with alpha helical canfoemation has to stretch across the cell, how many amino acids should it comprise of: 

  1. 18000

  2. 27000

  3. 1800

  4. 12000
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

No. of amino acid in one term in α helix = 3.6

Pitch length for α Helix = 5.4 Aº  
The No. of Amino acid in polypeptide
= 1.8 x $10^4$ Amino acid = 18000 amino acid
Thus A is the correct answer.